The invention relates to the technical field of decorative lighting, in particular to a festival decorative lamp and a preparation method thereof.The festival decorative lamp comprises an integrally-formed
polymer clay body, and a mounting hole is formed in the
polymer clay body in the axial direction; the light-emitting
assembly comprises a lamp wire arranged in the mounting hole in the axial direction and a
light source arranged on the lamp wire, the
light source is electrically connected with an external power source through the lamp wire, and light emitted by the
light source is transmitted outwards through the
polymer clay body on the
peripheral side of the light source when the light source is powered on; the soft and weak light layer wraps the outer side of the light source so as to weaken the intensity of light rays emitted by the light source, and the soft and weak light layer is made of a transparent material; by adopting the structure that the
polymer clay body is integrally formed and the mounting hole is axially formed to directly contain the light-emitting component, the defects in the prior art are effectively overcome, the design abandons an inner mold which is expensive and limits the shape in the traditional process, the production steps are simplified, and the cost is remarkably reduced.